G77, libg2c and a linking problem
Larry Hall (Cygwin)
reply-to-list-only-lh@cygwin.com
Tue Sep 19 22:30:00 GMT 2006
Angelo Graziosi wrote:
>
> Dave Korn wrote:
>
>> Can we then assume that the cernlib build process is doing something
>> unneccessary or unusual or incorrect?
>
> What would be 'unusual or incorrect' in
>
> $ cat hello.F
> program hello
> implicit none
> write(*,*) 'Hello!'
> end
>
> (1)
> $ g77 hello.F -o hello -L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -lg2c
> /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../libcygwin.a(libcmain.o):(.text+0xab):
> undefined reference to `_WinMain@16'
> collect2: ld returned 1 exit status
>
>
> (2)
> $ g77 hello.F -L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -lg2c -o hello
>
> $ ./hello
> Hello!
>
> ?
>
>
>> It should all become clear in terms of the linker's requirement that
>> undefined references must always come in objects earlier than the
>> symbols that satisfy those references
>
> I know this...but then '-o hello' contains symbols that satisfy previous
> references ?
> (compare (1) with (2))
I think you're speculating too much. What does it do without adding the
library and path in the first case? I'm not at a Windows box right now
but I get a similar link error from Linux in the first case. You'll
either see the same thing I do without the library (everything's fine)
or you'll see a different problem. If it's the former, your problem
is that you added the unneeded library. If it's the latter, it's an
ordering problem as Dave mentioned.
--
Larry Hall http://www.rfk.com
RFK Partners, Inc. (508) 893-9779 - RFK Office
216 Dalton Rd. (508) 893-9889 - FAX
Holliston, MA 01746
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